When you say no fire, I assume you mean no spark, which means the problem is not fuel related. If the problem is no spark when it gets hot, you need to address the other components of your ignition system. CDI, pickup coil, stator, maybe even the regulator/rectifier.
BTW, I added the year, make and model to the thread title, please include this info in the future when you start a new thread. If you could also post the engine size so that can be added too.
Yours truly, sincerelly, love always, Josh aka The DirtDemon.